public inbox for [email protected]  

help / color / mirror / Atom feed

From: Bruce Momjian <[email protected]>
To: Amit Langote <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Justin Clift <[email protected]>
Cc: Jonathan S. Katz <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL 12: Feature Highlights
Date: Tue, 14 May 2019 09:19:45 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAKJS1f-1=BoVkJaTnfb87nrVUFLprdc7smsBsF5MGyCXnNivzw@mail.gmail.com>
	<[email protected]>
	<CAKJS1f9=xUz5y=VDy6hYMVpSoej9+D2BminegmfqHwdWQfpQ9w@mail.gmail.com>
	<[email protected]>
	<CAKJS1f84HJj3qiDzpX9-iz_6AAdiX7khtgUf0UPVEmEd3YZ4hQ@mail.gmail.com>
	<[email protected]>
	<[email protected]>

On Tue, May 14, 2019 at 06:25:43PM +0900, Amit Langote wrote:
> Considering the quoted discussion here, maybe it's a good idea to note
> that only the operations that need to touch a small number of partitions
> are now processed efficiently, which covers both SELECT/UPDATE/DELETE that
> benefit from improved pruning efficiency and INSERT that benefit from
> improved tuple routing efficiency.  So, maybe:
> 
> 	Tables with thousands of child partitions can now be processed
> 	efficiently by operations that only need to touch a small number
>         of partitions.
> 
> That is, as I mentioned above, as opposed to queries that need to process
> all partitions (such as, select count(*) from partitioned_table), which
> don't perform any faster in v12 than in v11.  The percentage of users who
> run such workloads on PostgreSQL may be much smaller today, but perhaps
> it's not a good idea to mislead them into thinking that *everything* with
> partitioned tables is now faster even with thousands of partitions.

Agreed, I changed it to your wording.

-- 
  Bruce Momjian  <[email protected]>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +

view thread (63+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: Re: PostgreSQL 12: Feature Highlights
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox